Uses of Plant Hormones

Uses of Plant Hormones:

Selective weedkiller is a weedkiller that contains artificial plant hormones and will kill only certain types of plants. Most selective weedkiller kill plants with broad leaves and not those with narrow leaves.

Rooting powder is a powder that contains plant hormones called auxins that help plant cuttings to grow roots quickly.

Some fruits are sprayed with plant hormones so fruits develop without their seeds causing seedless fruit! Also some fruits are sprayed with gibberellins to increase their size.

Plant hormones are sprayed onto

• Fruit trees so the fruit doesn't fall off and becomes damaged; it also allows the fruit to grow larger.
• Fruit trees speed up ripening . So all the fruit ripens and can be picked up in one go.
• So unripe fruit can become ripe.

Key Words:

Selective Weedkiller
Rooting Powder
Cuttings
Ripening


Questions:

1. Why are weedkillers 'selective'?
2. What's an advantage of using rooting powder?
3. Why's plant hormones sprayed onto fruits?

What you should know:

How to analyse, interpret and evaluate data from plant hormone experiments , including the action of plant hormones and gibberellins.

How to demonstrate an understanding of the uses of plant hormones, including:
a. Selective weedkillers
b. Rooting Powder
c. Seedless fruit
d. Fruit ripening